Output circuits of class B type electronic amplifiers

Details Output circuits of class B type electronic amplifiers Output circuits of class B type electronic amplifiers

1984-08-03

1986-05-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330268, 330300, H03F 330

Patent

active

045889600

ABSTRACT:
The invention provides a class B output stage for an amplifier, more specifically an integrated circuit amplifier for low power, low voltage application, such as a hearing aid amplifier, that is of class B type with consequent negligible quiescent power dissipation, but which avoids the input voltage deadband of conventional class B stages that results in cross-over distortion. The stage uses a bipolar transistor and a field transistor connected in series. The field effect transistor has a gate-source pinch-off voltage that is approximately equal to the base-emitter voltage of the bipolar transistor, so that they are alternately "on" as the input voltage swings over its full value. In a preferred embodiment the bipolar transistor is an npn type while the field effect transistor is a bipolar compatible p-channel junction field effect transistor (JFET) with pinch-off voltage as close as possible but just less than the base emitter voltage of the bipolar transistor. The circuit is preferable realized in integrated circuit form.

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